Up on the roof

Did you know that you can climb (well, walk 'steeply') over the 02 in London (what used to be called the Millennium Dome)?

Vivien and I took the boat from Embankment to North Greenwich where we joined Martha and Tom for a 'Sunset Walk'. I don't like heights and was scared that I'd be scared but not a bit of it - it feels really safe and you're virtually tied onto the walkway.

Fantastic all round view (here we're looking across the river at Canary Wharf) and a top experience (literally).